Having done several Typescript migration on 100k+ line codebases, this rings entirely true for me. An additional problem with doing partial migrations is that

Having done several Typescript migration on 100k+ line codebases, this rings entirely true for me. An additional problem with doing partial migrations is that it leaves people in a position to just not fix the file they’re working on, since half converted files are the norm, and they have more important things to do.